首页|Nb?Si基超高温合金在900℃下的氧化和热腐蚀行为

Nb?Si基超高温合金在900℃下的氧化和热腐蚀行为

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对Nb−Si基超高温合金在900℃ 下的氧化和热腐蚀行为进行研究.结果表明:合金的氧化和热腐蚀动力学均由初始的抛物线增长阶段和随后的线性快速增长阶段组成.在氧化的初始阶段(1～50 h),合金表面形成较薄且连续的氧化膜,而在随后的线性阶段,合金表面发生严重的"粉化"现象.合金经热腐蚀后,其线性增长阶段发生得更早,同时在热腐蚀20～100 h后发生灾难性的氧化膜剥落现象,表明熔盐(Na2SO4和NaCl)能显著加快合金的氧化过程.STEM结果显示,热腐蚀后的氧化膜主要由TiO2、Nb2O5、TiNb2O7、非晶硅酸盐和NaNbO3组成.
Oxidation and hot corrosion behaviors of Nb−Si based ultrahigh temperature alloys at 900 ℃
Oxidation and hot corrosion behaviors at 900 ℃ of Nb−Si based ultrahigh temperature alloys were investigated. Both oxidation and hot corrosion kinetics curves of the alloy involve an initial parabolic stage and a later rapid linear stage. In the initial oxidation stage (1−50 h), a thin and continuous scale is formed on the alloy surface, while severe pest degradation phenomenon is observed in the linear oxidation stage. Compared with oxidation of the alloy in static air, a linear hot corrosion stage happens earlier and catastrophic scale disintegration occurs after hot corrosion for 20−100 h, demonstrating that molten salts (Na2SO4 and NaCl) could significantly accelerate the oxidation process of the alloy. STEM results indicate that the corroded scale consists mainly of TiO2, Nb2O5, TiNb2O7, amorphous silicate and NaNbO3.

Nb−Si based alloysmolten saltsoxidationhot corrosionsilicate

何佳华、郭喜平、乔彦强

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西北工业大学凝固技术国家重点实验室,西安 710072

Nb−Si基合金 熔盐 氧化 热腐蚀 硅酸盐

authors are grateful for the financial supports from the National Natural Science Foundation of Chinaauthors are grateful for the financial supports from the National Natural Science Foundation of ChinaNational Key R&D Program of China

51971181519711772017YFB0702903

2021

10.1016/S1003-6326(20)65488-7

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(1)
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